Advantages and Disadvantages of Prefabricated House Factories

The advantages of prefabricated house factories mainly lie in fast construction speed, lower costs, controllable quality, and environmental protection and energy efficiency; the disadvantages mainly include high initial investment, high transportation costs, limited design flexibility, room for improvement in seismic performance, issues at connection points, and quality risks.

Advantages

• Fast construction speed: Factory-prefabricated components are assembled on-site, saving a significant amount of time compared to traditional construction methods. For example, in the case of cement prefabricated houses, cement slabs are made in advance at the factory and assembled on-site like building blocks. Flat modules can be produced within 7 days, and the framework of a flat house can be erected in just a few days, which is 60-70% faster than traditional house construction.
• Lower costs: Factory production reduces material waste and labor costs, resulting in lower overall construction costs. Taking cement prefabricated houses as an example, their main structures are about 30% cheaper than brick houses, saving ordinary families 40,000 to 50,000 yuan. Additionally, maintenance costs are 40% lower than those of traditional houses.
• Controllable quality: The production process and quality control in a factory environment are more stringent, ensuring the quality and precision of components, reducing quality issues caused by human factors, and making the houses more robust and durable.
• Environmental protection and energy efficiency: Wet operations on the construction site are reduced, thereby reducing construction waste and environmental pollution. For instance, 40% of construction waste from cement prefabricated houses can be recycled, and carbon emissions are halved. Some projects have even received international certifications.

Disadvantages

• High initial investment: Factory construction, equipment purchase, and technological research and development all require substantial funds, posing a significant burden for ordinary families.
• High transportation costs: If the construction site is far from the production location of prefabricated components, long-distance logistics transportation increases costs. Especially when the distance between the factory and the construction site is great, costs rise further. For example, transporting cement prefabricated houses to remote areas can result in transportation costs accounting for 5% of the total cost.
• Limited design flexibility: The design freedom of prefabricated components may be somewhat restricted, making them less flexible and diverse than traditional construction methods. Currently, cement prefabricated houses can only be built up to two stories, and their facades are prone to color differences. After 5 years, there may be 15-20% color differences, requiring frequent maintenance.
• Room for improvement in seismic performance: Although prefabricated houses are designed with seismic resistance in mind, their seismic performance may be slightly inferior to that of traditional reinforced concrete structures. However, cement prefabricated houses have a factory prefabrication error of no more than 1 millimeter, can withstand magnitude-8 earthquakes in seismic tests, and have less overall settlement than ordinary houses.
• Issues at connection points: The connection points between prefabricated components are weak links. If the connection technology is inadequate or construction is improper, problems such as water leakage and air leakage may occur, affecting the overall performance and service life of the house. For example, the centimeter-thick prefabricated slabs of cement prefabricated houses have poor sound insulation, and the water leakage rate at seams is nearly twice that of traditional buildings, requiring regular waterproofing treatments.
• Quality risks: If construction is not carried out in accordance with regulations, cement prefabricated houses have a 7% probability of experiencing foundation settlement or wall cracks within 5 years. Construction in low-temperature environments is more prone to problems, and in some cases, maintenance costs after 5 years account for a quarter of the original construction cost.